feat(GCS+gRPC): support listing folders as prefixes (#13754)

Author: coryan

google/cloud/storage/internal/grpc/object_request_parser.cc

@@ -582,9 +582,10 @@ google::storage::v2::ListObjectsRequest ToProto(
   result.set_lexicographic_end(
       request.GetOption<storage::EndOffset>().value_or(""));
   result.set_match_glob(request.GetOption<storage::MatchGlob>().value_or(""));
-  if (request.GetOption<storage::SoftDeleted>().value_or(false)) {
-    result.set_soft_deleted(true);
-  }
+  result.set_soft_deleted(
+      request.GetOption<storage::SoftDeleted>().value_or(false));
+  result.set_include_folders_as_prefixes(
+      request.GetOption<storage::IncludeFoldersAsPrefixes>().value_or(false));
   return result;
 }
 

google/cloud/storage/internal/grpc/object_request_parser_test.cc

@@ -914,6 +914,7 @@ TEST(GrpcObjectRequestParser, ListObjectsRequestAllFields) {
         lexicographic_end: "test/prefix/abc"
         match_glob: "**/*.cc"
         soft_deleted: true
+        include_folders_as_prefixes: true
       )pb",
       &expected));
 
@@ -924,7 +925,8 @@ TEST(GrpcObjectRequestParser, ListObjectsRequestAllFields) {
       storage::IncludeTrailingDelimiter(true), storage::Prefix("test/prefix"),
       storage::Versions(true), storage::StartOffset("test/prefix/a"),
       storage::EndOffset("test/prefix/abc"), storage::MatchGlob("**/*.cc"),
-      storage::SoftDeleted(true), storage::UserProject("test-user-project"),
+      storage::SoftDeleted(true), storage::IncludeFoldersAsPrefixes(true),
+      storage::UserProject("test-user-project"),
       storage::QuotaUser("test-quota-user"), storage::UserIp("test-user-ip"));
 
   auto const actual = ToProto(req);

google/cloud/storage/tests/object_integration_test.cc

@@ -177,8 +177,6 @@ TEST_F(ObjectIntegrationTest, ListObjectsAndPrefixes) {
 }
 
 TEST_F(ObjectIntegrationTest, ListObjectsAndPrefixesWithFolders) {
-  if (UsingEmulator()) GTEST_SKIP();
-
   StatusOr<Client> client = MakeIntegrationTestClient();
   ASSERT_STATUS_OK(client);